Electrochemical properties in natural seawater of super austenitic stainless steel with plasma ion nitriding and electropolishing

被引:3
|
作者
Hwang, Hyun-Kyu [1 ]
Kim, Seong-Jong [2 ]
机构
[1] Mokpo Natl Maritime Univ, Grad Sch, Dept Marine Engn, Mokpo Si 58628, Jeonranam Do, South Korea
[2] Mokpo Natl maritime Univ, Div Marine Syst Engn, Mokpo Si 58628, Jeonranam Do, South Korea
来源
SURFACE & COATINGS TECHNOLOGY | 2024年 / 483卷
关键词
Anti; -corrosion; Super austenitic stainless steel; Natural seawater; Electropolishing; Plasma ion nitriding; Electrochemical properties; CORROSION-RESISTANCE; AISI; 316L; PITTING CORROSION; SURFACE-ROUGHNESS; ACID SOLUTION; TEMPERATURE; BEHAVIOR; LAYER; 304-STAINLESS-STEEL; MOLYBDENUM;
D O I
10.1016/j.surfcoat.2024.130748
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this investigation, electropolishing and plasma ion nitriding were applied to super austenitic stainless steel for the purpose of improving corrosion resistance and hardness. Electrochemical experiments were performed in natural seawater, which is used as scrubber wash water. Further, various experiments and analyses-such as FESEM, EDS, XRD, 3D laser microscopy, and potential measurement-were performed to evaluate both surface and electrochemical characteristics with the surface treatments. The hardness of electropolished and plasma ion nitrided stainless steel increased by 284.06 Hv and 1548.3 Hv, respectively, compared to mechanical polishing. After electropolishing, the surface roughness (Sa) decreased by approximately 78.2 % compared to mechanical polishing. And after plasma ion nitriding, CrN(precipitate) Fe 4 N(compound) and gamma N (expanded austenite) were observed on the surface. The thickness of the layer formed on the surface was expressed as 10 to 12 mu m In addition, the surfaces observed after the cyclic potentiodynamic polarization experiment revealed that local corrosion occurred in the mechanical polishing and electropolished specimens, whereas the plasma ion nitrided specimens presented a tendency toward general corrosion.
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页数:16
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